Policies & Publications

Design Guidelines


These documents have been prepared by the Wood I-Joist Manufacturer’s Association. Every attempt has been made to ensure that the data and information presented is as accurate and complete as possible and in a fashion representative of the industry at large. The user is cautioned that the data and information presented is indicative of I-joists in general. Consultation with the specific manufacturer regarding each proprietary joist is required prior to completing design and installation on any specific project.

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Code Requirements For Prefabricated Wood I-Joists



Code Requirements For Structural Composite Lumber (SCL)



WIJMA Statement: Membrane Protection of Floor Assemblies



Basis of IRC Membrane Protection Provisions



WIJMA Position Statement: Offset Bearing Walls


Establishing Prefabricated Wood I-Joist Composite EI



Establishing Shear Capacities with Web Holes



WIJMA Deck Connection Detail

WIJMA Position Statement: Solid Sawn Rim Boards


WIJMA Position Statement: 3/4″ Plywood or OSB used as Rim Board


Dropped Header Design Guide

WIJMA Sealed Caul Plate Test Method